Dentin is the substance between enamel or cementum and the pulp chamber. It is secreted by the odontoblasts of the dental pulp. The formation of dentin is known as dentinogenesis. The porous, yellow-hued material is made up of 70% inorganic materials, 20% organic materials, and 10% water by weight.
Medical Definition of metaplasia. 1  1: transformation of one tissue into another metaplasia of cartilage into bone. 2  2: abnormal replacement of cells of one type by cells of another.
Focal intestinal metaplasia is the potentially reversible change from a fully differentiated stomach cell type to an intestinal cell type. It is associated with significantly increased risk of cancer. . Metaplasia is the potentially reversible change from a fully differentiated cell type to another cell type. Metaplasia is associated with significantly increased risk of cancer. Therefore, it is defined as a precancerous condition. Metaplasia can occur in a variety of the bodyâs tissues. However, it is most commonly found in the stomach or intestines.